14 Pin character LCD, oki chips, not standard?

I took a 40x4 character LCD out of an old word processor i had, and I'm trying to figure out how to interface with it. I found that it had a 14
pin interface, 8 oki m5259 chips, and 2 larger unlabeled chips, both the same size. A bit of googleing led me to believe that it was a standard 14 pin LCD. I began trying to figure out what order the pins were numbered, so I started probing around the host device with a multimeter. I found some odd things. The Vcc pin (the only pin +5v on it in the host device) was located as such on the LCD:
(o = pin, v = Vcc)
o o o o o o o o o o v o o o
other than the +5v pin, most other pins had no voltage, however some had around 2v. Because of the positioning of the Vcc pin, it seems that it is not following the standard 14 pin LCD design, however it could just be a non-standard pin ordering. Messing around I have noticed that I can get rows 1 and 3 of the LCD to light (this same thing seems to happen as the LCD starts in the host device) if I connect +5v (v). ground (G), and ground (g) as such:
o o o o o o o o g o v G o o
I can also get the same effect with 'g' on several other pins, provided v and G don't move. Does anyone have any suggestions as to how I can determine the interface to this LCD. Note, that at the moment I simply want to connect up some dip switches and mess with it that way, then eventually get a PIC in on it.
Lastly, as a side-note, I wanted to know if its a good idea for me to be using an ATX psu as a workbench power source, for this and other project?
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I don't have any ideas on the LCD question. Just go buy one from digikey.
I think it is a great idea using old PC power supplies as bench power sources! I use the same. They are free, work great, and give you exactly what you need for most electronics.
Rich
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Its not really that i need a character LCD. just doing something for fun.
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Hi, I have been playing with a display that sounds similar.
They don't have an on board controller so are quite complicated to drive.
From what I've worked out you clock in both column and row signals and the chips do the multiplexing of these signals onto the display. This info needs to be updated continuously for it required quite a bit of overhead to keep the display updated. The word processor I hacked had a custom ASIC that was programmed to do all the hard stuff. Unfortunately I've not been able to get any info on this so I can't reuse it.
I've shelved the project for a while as it was becoming very complicated to generate the appropriate signals.
Regards. Robin
On 26 Mar 2005 23:15:01 -0800, snipped-for-privacy@gmail.com wrote:

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